Process of manufacturing packing and insulating material



w, .1. KRoPP 2,147,793

AQKING AND INSULATING MATERIAL Feb. 21, 1939. l

PROCESS OF MANUFA CTURING `P Filed June 4, 1957 .2 sheets-shet 1 QN Quwk @wl Il Feb. 21, 1939. 2,147,793

PROCESS OF MANUFACTURING PACKING AND INSULATING MATERIAL w. .1. Knopp I 2 Sheets-Sheet 2 v Filed June 4, 1937 Patented Feb. 21, 1939 UNITED STATES PATENT 1OFFICE v Paocrzss oF MANUFAcTUnmG PACKING AND INSULATmG MATERIAL William .L Kropp, Wichita, Kans. Application Jude 4, 1937, serial No. 146,503

-2 Claims.

loose' and fluffy form, the particles of the material being of an appropriate size.

One of the objects of the invention is the making of an insulating fibrous composition from refuse or waste paper,` such as newspaper print,

cardboard and the like, to produce a packing material useful as insulation in maintaining cer` taintemperatures. Such a material finds special application in storage packing and in storage i5 plants and is especially valuable as a filler, in.

tllite packing of articiesin crates, boxes and the li e. ,i l Still a further aim is the preparation of a product such ashA specified which is reproof; of a crumpled, lo'sem and fluffy, ake-like texture and consistency, the product being reducedduring the operation of the process to a size to pass through a one-eighth inch woven mesh screen. This application is a continuation-impart of my piior application, Serial No. 8,877, nled March Other aims and objects than those specied above will be apparent from the detailed description hereinafter Yappearing when taken ink conjunction with the appended drawings forming a part hereof to which reference is now made and in which- Figure 1 is a schematic elevational view of one form of apparatus adapted for making the product of the present invention; and

Figure 2 is a view similar to Figure 1. but of a modifiedlorm of apparatus.

Referring now to Figure 1 of the drawings, there ls shown `at Iii a paper feed of any ap- 40 proved or conventional form and which is adapted to supply refuse paper, old magazines, card# board or a mixture of the same to the cooking tank Il. As shown, the bottom of the tank Ii' may be heated by a `gas burner as IILor by means 4ol' steam coils or in any other desired.

manner. The paperl feed I0 is situated vertically above the cooking tank Il, as is also'a salt mixture dispensing device I2, and water feed tank Il. The dispensing device il contains a dry intimate reprooiing 'mixture of 8 parts by weight of ammonium sulphate, 3 parts by weight of boric acid, and 2 parts by weight of borax. Inthe operation of the process, 150 parts of water by weight is added to the cooking tank for each 13` parts of the salt mixture. After 'the addition of the reproong salt mixture and water to the cooking tank in the proportions specied above, the solution of these salts is heated to 122 F., followed by the addition of the paper stock with the heating v5 continued for a period of thirty minutes, whereby the stock is thoroughly impregnated with the salt solution.

The cooked stock is then removed from the tank -II and deposited on a drain board Il, where 10 the excess moisture is permitted to run olf. The

partially dried stockls then fed to a drying bin I5 and allowed to dry for a period of time sufilclent to remove an additional quantity of the moisture'- still present in the stock. Situated 16 vertically below the drying bin i5 is a feeding table i6 adapted to feed into a conventional hammermill machine I1, or lother comminuting device capable of reducing the product of a size hereinafter referred to. Leading to the latter 20 from the opposite directionis a dry paper stock feed i8 and an automatic ammonium sulphate dispenser I 9. y

`The feeding table I6 carries the stillsome what damp cooked paper stock from the drying 25 bin i5 and deposits it into the hopper Il'L of the hammermill I1. The dry paper feed I8 carries a quantity of dry untreated refuse paper, suclras initially used at the beginning of the` process and deposited from the paper feed i0, 30

to the hopper I'I. For every 25 parts by weight of damp cooked stock delivered to the hammermill, there is added to the latter '75 parts by weight of dry stock by means of the dry paper feed I8. For every hundred parts lof combined 35 damp anddry paper stock, there is deposited in the hammermill five to ten parts of dry ammonium sulphate from the feeder or dispenser Il. The mixture of damp paper stock, dry stock and dry ammonium sulphate is commirluted in 4i the hammermill I'l so that the resultant product is a'dry material of a size to pass through a one-,eighth inch mesh screen forming a part of the mill; the heat generated by the action of the hammers of the hammermill on the product during the comminuting action thereof serv--V ing to remove the last traces of moisture from theproduct. 'I'he material thus treated is drawn from the hammermill by a blower 20 and deliv- 5@ ered to the dust separator 2l from which it passes to a filling pipe 22 for packing into sacks 23. The dust separator removes allI the dust generated by 'the hammermill so that 'the final product delivered to the sack 23 is in a iiuffy, -55

loose form oi' substantially. uniform size and consistency.

Referring now to the apparatus shown in Figure 2 of the drawings, the newspaper, cardboard and thelike is first comminuted in a hammermill 30 provided with a one-half inch wire screen. A blower 3| removes the product from the hammermill 30 to a bin 32 from which it is fed to cooking tank 33 provided with burners 33. The cooking tank contains a salt solution of the character specified with reference to the description of the apparatus of Figure l and the proportions of materials and the temperature of the cooking is the same as already described. Cooking tank 33 is provided with beaters 34 which force the cooked material through the salt solution after which the treated paper is taken up on a conveyor 35 to a wringer 36 which squeezes out a considerable quantity of the moisture in the paper. From the wringer 36 the treated paper passes to conveyors 31, 38 to beaters 39y provided with burners 39* at which point the dry ammonium sulphate salt is added. The treatment at this point in the apparatus further dries the damp paper and additionally breaks it up into particles. From beaters 39 the broken material passes to a steel conveyor belt 4|) provided with burners 4|]Ll where final drying takes place. A conveyor 4| carries the dried material to hopper I'l'L of hammermiil l1, from which it is drawn by blower 2|) and delivered to dust separator 2| and through filling pipe 22 into sacks 23 as in the apparatus described in Figure 1.

Various other changes and modifications may be made to embody the spirit and purpose of the invention and it is contemplated to cover such variations and to be limited in this respect only as may be necessary by the scope of the appended Having thus set forth the invention what I claim as new and desire to secure by Letters Patent is:

1. The process of making a fibrous packing and insulating material in loose and fiuii'y form. com.i prising taking sheets of ilbrous material and cornminuting same, then cooking said comminuted material in a Water solution of reproofmg salt, then treating said cooked material to remove water therefrom while adding dry salt thereto, and comminuting the treated material to form a mass of loose, fibrous particles of a size such as n will pass through a one-eighth inch Woven mesh screen.

Z. The process of making a brous packing and insulating material in loose and fluffy form, comprising taking sheets of paper, and cooking said paper in a Water solution of flreproong salt, removing Water therefrom, and comminuting the relatively dry paper to form a mass of loose, brous particles of a size such as will pass through a one-eighth inch woven mesh screen.

' WILLIAM J. KROPP. 

